<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card>
      <!--头部警告区域-->
      <el-alert show-icon title="注意: 只允许为第三级分类设置相关参数" center type="warning" :closable="false"></el-alert>
      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!--:options="catelist"这是数据源，获取到的是一个数组，然后在下面的配置对象中要用展开运算符把它们展开才能显示出来-->
          <el-cascader
              v-model="selectedCateKeys"
              :options="catelist"
              :props="{ expandTrigger: 'hover',...cateProps }"
              @change="handleChange"
              clearable>
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template v-slot="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{ item }}</el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!--静态参数表格-->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand"></el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!--添加参数的对话框-->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>

    <!--编辑参数的对话框-->
    <el-dialog :title="'编辑' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
import axios from "axios";

export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择器的配置对象
      cateProps: {
        //通过value属性指定具体选中的那个值
        value: 'cat_id',
        //通过label属性指定你所看到的是哪个属性
        label: 'cat_name',
        //通过children属性来指定父子嵌套用的是哪个属性
        children: 'children'
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活的页签的名称
      activeName: 'many',
      //动态参数的数据
      manyTableData: [],
      //静态参数的数据
      onlyTableData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [{required: true, message: '请输入参数名称', trigger: 'blur'}]
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //编辑参数的表单数据对象
      editForm: {},
      //编辑表单的验证规则对象
      editFormRules: {
        attr_name: [{required: true, message: '请输入参数名称', trigger: 'blur'}]
      },
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态设计添加参数标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态参数'
      }
    }
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.catelist = res.data
    },
    //级联选择框选中项发生变化,会触发这个函数，
    async handleChange() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //根据所选分类的id，和当前所属的面板，获取对应的参数
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏  p133
        item.inputVisible = false
        //文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //tab页签点击事件的处理函数
    handleTabClick() {
      //调用一下这个函数，要不然第一次选中后可以获取参数，但是在下面的面板切换的时候就不会发生第二次请求了
      this.handleChange()
    },
    //监听添加参数对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    // addParams() {
    //   this.$refs.addFormRef.validate(async valid => {
    //     if (!valid) return
    //     const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
    //       attr_name: this.addForm.attr_name,
    //       attr_sel: this.activeName
    //     })
    //     if (res.meta.status !== 201) {
    //       return this.$message.error('添加参数失败!')
    //     }
    //     this.$message.success('添加参数成功!')
    //     this.addDialogVisible = false
    //     this.handleChange()
    //   })
    // },

    //第二种添加参数的请求方式
    addParams() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) return
        axios.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        }).then(res => {
          if (res.data.meta.status !== 201) {
            this.$message.error('添加参数失败!')
          }
          this.$message.success('添加参数成功!')
          this.addDialogVisible = false
          this.handleChange()
        }).catch(err => {
          this.$message.info('添加参数网络请求失败!')
        })
      })
    },

    //点击编辑按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: {attr_sel: this.activeName}
      })
      if (res.meta.status !== 200) {
        return this.$message.error('查询当前参数失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 监听编辑参数对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮，编辑参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('编辑参数信息失败!')
        }
        this.$message.success('编辑参数信息成功!')
        this.handleChange()
        this.editDialogVisible = false
      })
    },
    // 点击删除按钮，进行删除参数信息操作
    // async removeParams(attr_id) {
    //   const confirRustle = await this.$confirm('此操作将永久删除该参数, 是否继续?', '删除参数', {
    //     confirmButtonText: '确定',
    //     cancelButtonText: '取消',
    //     type: 'warning'
    //   }).catch(err => err)
    //
    //   if (confirRustle !== 'confirm') {
    //     return this.$message.info('已取消删除操作!')
    //   }
    //   const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
    //   if (res.meta.status !== 200) {
    //     return this.$message.error('删除参数信息失败!')
    //   }
    //   this.$message.success('删除参数信息成功!')
    //   this.handleChange()
    // }

    //第二种删除请求的方法
    async removeParams(attr_id) {
      const confirRustle = await this.$confirm('此操作将永久删除该参数, 是否继续?', '删除参数', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirRustle !== 'confirm') {
        return this.$message.info('已取消删除操作!')
      }
      axios.delete(`categories/${this.cateId}/attributes/${attr_id}`).then(res => {
        if (res.data.meta.status !== 200) {
          return this.$message.error('删除参数信息失败!')
        }
        this.$message.success('删除参数信息成功!')
        this.handleChange()
      }).catch(err => {
        this.$message.info('删除请求失败!')
        console.log(err)
      })
    },
    //tag文本框失去了焦点或按下了Enter都会触发这个函数
    async handleInputConfirm(row) {
      console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //需要发起请求，保存这次操作
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('编辑参数项失败!!')
      }
      this.$message.success('编辑参数项成功!!')
    },
    //点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      //$nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //
    async handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('编辑参数项失败!!')
      }
      this.$message.success('编辑参数项成功!!')
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 20px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 100px;
}
</style>